Defence System for MANETs. Mobile Adhoc Networks

Table of Contents

Chapter – I: Introduction

1.1 Introduction

1.2 Characteristics of MANETs

1.3 Architecture of MANETs

1.4 MANET Standards

1.5 MANET Challenges:

1.6 Security Challenges:

1.7 Criteria for Security in MANET:

Chapter – II: State of Art and Literature

2.1 Introduction

2.2 Proactive Routing Protocols:

2.3 Reactive protocols:

2.4 Position Based Routing Protocols:

2.5 Routing Protocol Comparison

Chapter – III: Proposed Secure Multipath Routing Protocol

3.1 Introduction to Proposed Routing Protocol

3.2 Secure Multipath Ad Hoc On-Demand Distance Vector Routing Protocol (SMAODV):

Chapter – IV: Experimental Evaluation:

4.1 Introduction

4.2 Simulation Results

Chapter – V: Conclusion and Future

5.1 Summary

5.2 Future Work

Research Objectives & Topics

This work aims to address critical security vulnerabilities in Mobile Ad Hoc Networks (MANETs), specifically focusing on malicious nodes that drop packets despite appearing legitimate. The research objective is to develop and evaluate a secure routing protocol (SMAODV) that utilizes multiple paths and rebroadcasting mechanisms to mitigate the impact of such attacks on network availability and performance.

• Security challenges in MANET architectures
• Limitations of existing routing protocols like AODV, DSDV, and DSR
• Implementation of Secure Multipath Ad Hoc On-Demand Distance Vector (SMAODV)
• Experimental analysis using Network Simulator (NS-2)
• Comparative performance evaluation against standard protocols

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Summary of Chapters

Chapter – I: Introduction: Provides an overview of MANETs, their unique characteristics, architectural models, standardization, and the fundamental security and operational challenges they face.

Chapter – II: State of Art and Literature: Reviews existing routing protocols, classifying them into proactive, reactive, and position-based categories, while highlighting their limitations regarding security in hostile environments.

Chapter – III: Proposed Secure Multipath Routing Protocol: Introduces the SMAODV protocol, which modifies existing multipath techniques to incorporate path randomization and packet loss detection to isolate malicious behavior.

Chapter – IV: Experimental Evaluation: Details the simulation setup using NS-2 and presents comparative results regarding packet delivery ratio, throughput, and end-to-end delay against established protocols.

Chapter – V: Conclusion and Future: Summarizes the effectiveness of the SMAODV protocol in improving network security and suggests potential avenues for future research including application to VANETs.

Keywords

MANET, Secure Routing, AODV, SMAODV, Multipath Routing, Network Security, Packet Delivery Ratio, Throughput, Malicious Nodes, Wireless Networks, Simulation, NS-2, Rebroadcasting, Routing Protocols, Data Integrity.

Frequently Asked Questions

What is the primary focus of this dissertation?

The work focuses on enhancing the security of MANETs by introducing a secure routing protocol that mitigates the impact of malicious nodes that drop data packets.

What are the core thematic areas covered?

The core themes include MANET architecture, routing protocol classification, security vulnerabilities in ad hoc environments, and performance optimization through multipath routing.

What is the main objective of the proposed SMAODV protocol?

The primary objective of SMAODV is to guarantee a security solution that defends against attacks on availability by utilizing multiple paths between source-destination pairs to bypass malicious routes.

Which scientific methodology is employed for evaluation?

The researcher uses a simulation-based methodology, specifically employing the NS-2 (Network Simulator) platform to construct MANET scenarios and compare performance metrics.

What does the main body of the work cover?

The main body covers the theoretical background of MANETs, a review of existing state-of-the-art routing protocols, the technical design of the proposed SMAODV algorithm, and an experimental performance evaluation.

Which keywords best characterize this research?

Key terms include MANET, Secure Routing, SMAODV, Multipath, Packet Delivery Ratio, and Network Security.

How does SMAODV distinguish between legitimate and malicious nodes?

SMAODV does not explicitly detect the malicious node itself, but rather monitors packet loss. If a route causes significant packet loss, the protocol identifies it as unreliable and eliminates it, thereby removing the influence of the malicious node.

What is the role of the "rebroadcasting timer" in the proposed protocol?

The rebroadcasting timer is used to trigger periodic re-flooding of RREQ packets, allowing the network to continuously update and discover fresh alternate paths to adapt to the high dynamism and mobility of MANET nodes.

How is the "counter value" utilized at the destination node?

The destination node uses the counter value of received packets to detect inconsistencies. If a gap exceeds a certain threshold, it indicates packet loss, prompting the destination to request retransmission via a different route.